Vampire murdered in his coffin

An odd case has taken place in Transylvania. Before burying his mother, a young man plunged a silver poniard into her heart. He did this following the advice of a local priest. The priest believed that the deceased was a vampire and this act would prevent from coming back to life.
According to Religia v Rossii referring to “reports from Romania,” Nikolae Mikhut, the son, saw that a cat had climbed into his mother’s coffin. According to Romanian folklore, this signifies that the person in the coffin could become a vampire. Moreover, Mikhut noticed (or it just seemed to him) that his mother’s lips and cheeks were too pink, as if she were not dead at all.

For a long time, the frightened young man could not find the courage to speak to the priest, though, when he finally did it, the priest told him what needed to be done.
Mikhut told the press that when he had plunged the silver poniard into his mother’s heart, they had heard a loud sigh, and just afterwards, his mother's face turned white. “Though, we had to do it, otherwise she could have returned to kill us,” – he said. Is this fact or fantasy?
Anyway, mass culture’s influence upon the human mind, mainly the influence of TV and cinema, and the spreading of so-called “white” and “black” magicians and mystic teachings are not harmless for human psychology.

One could hardly count all the horror films devoted to vampires that have recently appeared, as well as a great amount of pseudo-scientific books exaggerating this subject.

In general, myths about vampires refer to pagan period of the history. The vampire is present in the myths of different nations.
Of course, there is not smoke without fire. However, if vampires (including energy vampires) really exist, they hardly possess the eternal life myths ascribe to them.